Fuse-terminal-attaching means



A. L. EUSTICE.

FUSE TERMINAL ATTACHING MEANS.

APPLICATION FILED MAR. a1. 1919.

1,393,102, Patented Oct. 11, 1921'.

2 SHEETS-SHEET I.

HHIII llllllI-lnllIl-IIIIHI' Vlllillllllllllllvm- A. LQ EUSTICE.

FUSE TERMINAL ATACHING MEANS.

APPLICATION FILED MAR. al. 191s.v

1,393,102- mma oet. 11, 1921.

2 SHEETS-SHEET 2.

UNITED STATES' PATENT oFF-lors Lrnnn L.` EUsrrcE, or cHrcAGofrLLINoIs.

FUSE-TERMINAL-ATTACHING- MEANS.

application med March-31, 1919. seriaiNo. 286,446:

kTo all whom it may concern:

Be it known that I, ALFRED L. EUs'rroE, a citizen of the United States, residing at Chicago, in the county of Cook and State -of Illinois, have invented certain new and useful Im rovements in Fuse-Terminal-Attaching cans, of which'the following is a specification.

The present invention relates to a terminal attaching means for renewable fuses; and has for its ob'ects, to provide such a means which will e ectively control the discharge of gas incident to blowingi of the fuse; which will be convenient to manipulate in assembling and disassembling; free from binding of its parts by fuse metal; and which will be of relatively low cost in production.

The invention proceeds upon the principle of providing an anchoring means which is interlocked against both rotary and lon- Vgitudinal movement relatively to the terminal, and which is in turn adapted to be coni-ined against both rotation and longitudinal displacement upon .the end of the fuse shell, by means of a clamping ferrule or collar.

In my application SerialfNo. 241,115.,4 filed'.

June 21, 1918, is described a combined gas check and terminal lock end-closure, in which a disk composed of complementary members meeting at the terminal and interlocking therewith against both rotary and longitudinal movement develops an effective gas check at the-intersection of the terminalwith the disk and affords an anchoring means, which, being clamped over the end of the shell by means of the ferrule and circumferentially interlocked with the shell by means of lugs, affords an effective means for anchoring the terminal against rotation and longitudinal displacement of the shell.

In my application Serial No. 252,334, lfiled September 3, 1918, is disclosed a combined gas check and terminal lock, according to which a cylindrical disk or flange permanently mounted upon the terminal immediately beneath its shoulders, is fitted within an internal iange upon the end of the shell and locked longitudinally therewith by the shoulders of the terminal on the outside and.

afteifwhich a disk is dropped into position to seal the space between the permanent disk on the terminal and the internal flange on the shell, which disk, being slotted to fit the terminal and carrying projections that drop into end notches of the shell, is adapted to hold all the parts against rotation when the outer ferrule or end cap clamps it to the end of the shell. In such an arrangement, it will be seen that the disk permanently attached to the terminal affords a fixed abut'- ment for securing the terminal against longitudinal movement, also means for centeringthe disk and its attached fusible .link in the shell;

According to the present invention, a permanently attached disk is employed as a centering meansvand also as a fixed abutment to resist longitudinal movement, but the internal flange on the shell is substituted by a removable member which enters between the fixed abutment and the shoulders of the terminal for anchoring the terminal longitudinally; and this removable member or anchoring disk also takes the place of the locking disk of the former construction, in that, being made to conform to the section of the terminal and carrying lugs that drop into notches in the end of the shell, it also becomes the means for holding the terminal against rotation.

Two embodiments of the present invention are disclosed herein by way of illustration. A

. Referring to the accompanying drawings;

Figures 1 and;2 are axial sectional views in planes at right angles to each other, showing one embodiment of the features of the present invention;

Fig, 3 is a section on the line 3 3 of Figs. 1 and 2;

Figs. 4 and 5 are respectively an yunder face view of an edge v1ew of the anchoring disk, with its interlocking means in' releasing position;

Fig. 6 is a detail view of the terminal with its fixed abutment;

Figs. 7 and 8 are axial sectional views .in planes at right' angles to each other, showing a modified construction of fuse embodying features of the present invention;

' lig. 9 is a section on line 9 9 of Figl 7 3.11

Figs. 1() and 11 are respectively an under face view and an edge view of the anchoring disk, with its unlocking means in releasing position. f y

In referring to both embodiments of the threaded into the shell at invention, 1 represents a shell, which is preferably bushed at its ends by metal liners 2,

2a and having exthat receive the securing ferrules 3, as in my previous applications referred to. 4 represents the terminal, which in the present illustrative, embodimentsv is a so-called knife blade terminal; but it is to be understood that as a securing and gas check means, the features of the present invention ternal threads 2b will be applicable to a terminal which serves only to hold the fusible link within the shell, and to electrically connect the same with the ferrule 3,if it shouldbe desired to use the latter as the means of electrically introducing the fuse into the circuit. Terminal 4 carries a ixed abutment 5, which is preferably in the form of a circular disk which ma be made to substantially fit within the bushing 2 and thereby center the terminaliand its fusible link within the shell. The fixed abutment is preferably secured permanently to the terminal 4, as, for instance, by striking up the metal, as indicated at 5X (Figs. 1, 6 and 7.)

As thus far described, the construction is not materially different in principle from that of my application Serial No. 241,115, nor different in details of construction from that of my application Serial No. 252,334, and the present construction corresponds even more closely with the latter co-pending application, in that the fixed abutment is preferably provided with an additional lamina of metal 5a, Figs. 1, 2 and 6, or 5", Figs.

7 and 8, to better adapt it to serve as a gas check as hereinafter described.

According to the present invention,tthe means for holding the terminal against longitudinal and rotary motion on the shell comprises an anchoring disk 6, found in both embodiments of the present invention, slotted to fit the section ofthe terminal 4, and d of such diameter that it will fit over the end of the shell and be clamped thereon by the ferrule 3, and which carries lugs or projections 7 that enter notches 8 in the liner of the shell, so that when it is so clamped in position, it will be adapted to hold the terminal against rotation in addition to holding it longitudinally.

The anchoring member 6, according to both embodiments of the present invention, is further, provided with means (separately described below), for releasably interlocking it with the terminal 4, which interlocking means preferably also serves to render the anchoring means, in its relation to the terminal and fixed abutment, sufiiciently gastight to prevent longitudinal discharge of gas incident to blowing of the fuse.

According to the embodiment shown in Figs. l to 6, the additional lamina 5a of the fixed abutment is of less diameter than the disk 5, and the anchoring disk 6 is provided with an annulus that ts snugly around the lamina 5, like a cylinder iits lts piston; and said annulus is divided diametrically into two members 9, swiveled at 7 upon the disk 6, and thereby adapted, when the terminal 4 1s slipped through the slot 6a of the disk 6, to swing inwardly about the lamina 5n and enter between the xed abutment disk 5 and the shoulders 4a of the terminal, and so interlock the anchoring disk longitudinally with the terminal.

In this position, it will be seen that the fixed abutment disk 5 overlaps the joint between the annulus formed by the members 9 and the lamina 5L on the inner side, when said joint is overlapped by the clamping joint 6 on the outside, so'that an effective gas check is provided, nor can gas escape along the sides of the terminal blade, for the passage is closed there by the tight fit of the fixed abutment disk 5, and preferably also by the lamina 5a of the iixed abutment,

With this organization of parts, it is simply necessary to secure the anchoring member 6 against rotation upon the shell, which, as stated, is effected by having the projections 7 on the anchoring member enter the notches 8 in the end of the shell. These projections are conveniently provided, v as shown, byextending the pintles of the lock; ing members 9 below the plane of said members. They are preferably not only dropped into the notches 8, but are let into the edge of the fixed abutment disk 5 through means of notches l0 (see Fig. 3), whereby they afford additional security against rotation of the blade of the terminal and also localize the escape of gases blowing adjacent to the notches 8, through which the gases gain access to the threads of the ferrule or end cap. According to the form shown in Figs. 7 to l1, the interlocking means carried by the isk 6 is in the form of a divided disk, the members 9a of which, ivoted upon the pintles 7, as in the first orm, are recessed on their meeting edges to conform to -the section of the terminal blade 4, and also to provide tongues 9ax that meet within a slot 4b of the terminal 4. By this means the anchoring member 6 finds its fixed abutment by direct engagement with the terminal, and to that extent is somewhat similar in principle to the construction shownin application Serial N o. 241,115, land the outer lamina 5M of the fixed abutment' disk 5 in this instance, in order that it may serve as a gas check, fits snugly around the blade 4 and is pressed against the locking members 9L by means of a spring, l1 introduced between it and the fixed locking disk.

In the present form, as in the form first described, the projections 7 drop into recesses in the end of the shell to hold the anchoring member 6 against .,rotation,and the member 6, being firmly gripped upon the 4terminal 4, is adapted to hold the latter vcheck the escape of gas around the outer edge of the anchoring member, to compel the gas to escape by way ofthe circuitous passage afforded by the threads.

1. In a fuse, a shell, a terminal, an anchoring member, and means for clamping the anchoring member upon the shell; saidl terminal having longitudinally presented abutments, a cylindrical portion between said abutments, and a non-cylindrical portion; andsaid anchoring member comprising a portion adapted to embrace the noncylindricalportion of the terminal to resist rotation of the latter, and members movable into and out of embrace with the cylindrical portion and between said abutments, and thereby resisting longitudinal movement of the terminal.

2. In a fuse, ashell, a terminal, an anchoring member for the terminal, and means for clamping the anchoring member to the shell, said terminal having a fixed abutment member, said anchoring member comprising a portion adapted to embrace the terminal to resist rotation thereof, and a locking 'means entering between a portion of the terminal and its fixed abutment, and said fixed abutment being adapted to overlie the joint between the anchoring member and its locking means.

3. In a vfuse, a shell, a terminal having longitudinally spaced shoulders, an anchoring member, and means for clamping the anchoring member to the shell, said anchor- I 'ing member being slotted to receive the ter- -minal and conforming thereto, and having means for interlocking it to the terminal longitudinally, comprising a pair of members movable on the anchoring member into andvout of engagement with the terminal between its shoulders.

4. In a fuse, a shell, a terminal having a fixed abutment and a shoulder spaced therefrom, anl anchoring member fitted to the terminal to resist rotation thereof, and having means for interlocking it longitudinally with the terminal, comprising a pair of members pivoted on the anchoring member and swinging into and out of engagement with the terminal between its fixed abutment'and its shoulder.

5. In a fuse, a shell, a terminal having a fixed abutment and a,l shoulder spaced therefrom, an anchoring member fittedV to the terminal to resist rotation thereof, and having means :for4 interlocking it longitudinally.

with the terminal, comprising a pair of members pivoted on the anchoring member and swinging into and out of engagement with the terminal between its fixed abutment and its shoulder, said fixed abutment having means overlapping the interlocking means to check the flow of gas past the latter. f1

6. In a fuse, a shell, a terminal entering the shell, an anchoring means embracing the terminal and longitudinally locked therewith; said terminal carrying a disk within the anchoringvmeans, and said anchoring means having projectionswhich engage both the shell and the disk on the terminal. j

7. In a fuse, a shell, a terminal, an anchoring means, and means for clamping the Aanchoring meansy to the shell, said anchoring means carrying interlocking members pivoted thereon and movable into and out of engagement with the terminal, the pivots of said interlocking members being extended to provide projections on the anchoring member which engage with the shell.

8. In a fuse, a shell, a terminal having a fixed abutment, an anchoring member, and means for clamping the Ianchoring member to the shell; said fixed abutment having a. cylindrical portion, and said anchoring member having means with which` it interlocks with the terminal, surrounding said cylindrical portion of the fixed abutment.

9. In a fuse, a shell, a terminal, an anchoring member, and means for clamping the anchorinoV member upon the shell, said terminal having a fixed abutment comprising a disk and a cylindrical lamina of less diameter than the disk, and said anchoring means having an annular interlocking means overlying the disk of the fixed vabut- -ment and conforming to the circumference of its reduced lamina.

l0. In a fuse, a shell, a terminal, an anchoring means for said terminal, and a fixed abutment on the terminal engaged by said. anchoring means; the fixed abutment comprising a disk having a cylindrical portion of reduced diameter, and the anchoring means comprising a disk having an annular interlocking means which lies between the disk of the anchoring means and the disk of the fixed abutment and surrounds the re-l duced portion of the latter.

1l. In a fuse, a shell, a terminal extending into the shell, an anchoring means comprising a disk slotted to receive the terminal and having means vfor interlocking it longitudinally with the terminal, and said terminal having a fixed 4abutment comprising a anchoring member, overlying the disk of the xed abutment, and swing-ing into and out@ projections on the anchoring member, said of embracing relation to the reduced portion of the fixed abutment.

l2. In a fuse, a shell, a terminal entering' theshell, an anchoringmember for longitudinally and cireumferentially fixing the terminal relatively to thefshell, comprising an anchoring disk slotted to receive the terminal and provided With a pair of interlocking members pivoted upon its face and having their pivots extended toform imvard terminal being provided with a fixed abutment disk radially voverlapping the interlocking means of the anchoring member, and the inward projections on the anchoring member being notched into both the fixed abutment disk and the end of the shell.

Si ned at Chicago, Illinois, this 26th day of arch, 1919.

ALFRED L. EUSTICE. 

